Well no, but wrongly highlighting that there aren't any defensive midfielders at better clubs and rightly highlighting that they aren't anything special doesn't disprove that Liverpool need a DM. People may not agree with it, but there would have to be a better case presented than that for it to be worth listening to, IMO.
I think the system we're playing demands one. The real question here is whether supporters feel Lucas is up to it, because he's going to have it harder than in the past because we're attacking in higher numbers. I'm not counting him out, but he is coming back from a serious injury, and adding some competition is only going to help the club.